The Amp Garage

Hey guys I am reviving this thread as I am exploring how to rack ODS preamps. Any news on sharing DIYLC Files on the amp garage? Could not find anything yet. I will start assembling some boards myself, but it would be great if I could fast track the process and share these files along the way. Looki...

Very interesting Martin.
Are you working on a racked version of the ODS preamp?

Fred.

Pretty fat sound!
How did you manage the eq?
Your build displays very few knobs, did you go for an HRM topology with dirt EQ inside the chassis?

Fred.

Following this topic, as amps are taking a lot of space! Thinking on my end to have a 100 watts power station : 50 watts with 6L6 and 50 watts with el34 I think having some sort of - input level control - presence control or cut control there is also room to play with - rectifier tube vs diode recti...

Wow very nice build! I am contemplating the rack approach because amps is taking a lot of space, and they don't allow same agility of combinations between preamps and power stages. Speaking of D-lator, I did one in a pedal enclosure, and is very quiet as well. 17082108593263594049632767590881.jpg Wh...

Found a way to tame the output in adding a d-lator in between. Works pretty well ! I have tried a different EQ on the dirt side and 3'o clock for treble and mid while bass is almost off seems to do the trick. I get the anger without the flab of the bottom end. It remains defined and not too compress...

Again thanks for all the help and kind words. This quest for tone is enabled by guys like you, sharing without limit what you have documented, experienced. I am very grateful to this community! Agreed, the Tweedle Dee is also the amp I have played most. Second is ODS between 183 and 102 that has a f...

Double post

Hey Ian, Guy, thanks for the kind words!

Fred.

Found the issue, bias was too cold. Need to swap resistors but in the meantime alligator clip is more than enough to play the beast and bias it to 40mA with 422V plate voltage I change the value of the mid pot for a 100k, I love the tweedier clean tones, feels like the amp is right there in your fac...

I tried the preamp out into another amp cause the clean was bugging me. It is outstanding, very close to the john Mayer amp feel and no issue with the overdrive, channel, so something is happening down the line. Will check voltages again, but nothing seemed of.

Fred.

It's alive and kicking! I have some oscillation going on in the background, could be because of crapy tubes, used whatever was around to test the amp. OD feels like a Marshall, and EQ responds quite well. Clean has not much headroom with humbuckers. Past 9o clock and the preamp starts to overdrive. ...

After tweaking like crazy all morning, adding RC elements, separating decoupling the tube halves, changng pot, raising the wires in the air.. all what should stop osc - nothing. V1a stopping with LF osc only when i disconnect V1b! Now im quitting , mazbe i ll rebuild all, but at the end i was chang...

bepone wrote: ↑Fri Jan 05, 2024 8:38 am 100k below the tail in PI?

Oups, mistake indeed, corrected, thanks Bepone.

Fred.

A quick update on the build, slowly getting there, as I am missing a few resistors and caps. That feeling when you realize you're missing one diode, the day after placing your order at mouser! The boards are almost populated, planning on testing a few different coupling caps in the overdrive section...